Fix `attributes_before_type_cast` for serialised attributes.

Public method `attributes_before_type_cast` used to return internal AR structure (ActiveRecord::AttributeMethods::Serialization::Attribute), patch fixes this. Now behaves like `read_attribute_before_type_cast` and returns unserialised values.

1 files changed, 10 insertions, 0 deletions

diff --git a/activerecord/lib/active_record/attribute_methods/serialization.rb b/activerecord/lib/active_record/attribute_methods/serialization.rb
index ada79c3567..5b9ed81424 100644
--- a/activerecord/lib/active_record/attribute_methods/serialization.rb
+++ b/activerecord/lib/active_record/attribute_methods/serialization.rb
@@ -119,6 +119,16 @@ module ActiveRecord
             super
           end
         end
+
+        def attributes_before_type_cast
+          super.dup.tap do |attributes|
+            self.class.serialized_attributes.each_key do |key|
+              if attributes.key?(key)
+                attributes[key] = attributes[key].unserialized_value
+              end
+            end
+          end
+        end
       end
     end
   end